Draft regulator



x Patnted 20; I

HQMA'URIG'E FRANK EucncHIsoiv, DECEASED, LATE o HEENDO we ee Application filed March "S eIiQIj-NQ-LQBA This invention has for itsobject the provisionor" a novel form'of draft-regulator for use in asteam heating system whereby the draft-through the furnace will be cutoff or opened automatically as thepressure in the system rises or falls.

been established.

the invention A preferred form of the invention is illustrated in the accompanying drawing andc hereinafter fully set'forth and more particularly defined in the appended claims. In the drawing:i; I i v Fig. 1 is an elevation of a device embodying Fig. 2 is a top planview of the'same;

Opposite that seen in Fig. 11f

ible diaphragm (not shown) 'of'welleknowln ing may lee-secured in level position upon a furnace, and it is furthe'r pro'vided with a: central nipple 4 on its bottointo be coupled into the boiler of the furnacefand establish communication with the steam space thereof it h 'fih r so hat t e diap ragm or bellows w1ll be sub 7 :dampepactuatingbar; when the described travel of the pin 17 brings to thenotch 18', the spring Qrljatoncej'contractsand rocks-the" jected to the steam pressure. Risingfrom the bellows and extending through thetop;

of the casing is a post 5,- and secured torsaid post is the member 6 having its up'per end-j forked'to span a lever;.17 which isconstructed at one end with a yoke or. bridge 8 and at 1 said end is pivoted upon a fulcrum post or s lug 9' formed on the topofthe casing and fitting within an opening'providedtherefor in the lever.

A damper-actuating bar, ,indicatedby the dottedolines 10, is inserted through 'the gyoke 4 8 and secured by a setscrew' ll which clamps it in notched lugs 12 on the upper side of the lever, said bar being connected with the fur- 1 U'rcHIsoN', nnivniristrimmnrgr, on I- I ERNBONLVIRGINIA i In carrying'out the invention thereispro; l i d vided a casing 1 containing a bellows or flex v enters the notch 18. The spring 21 having VIRGINIA, B YLGL' E the u n Pr nds d po edatopp i ie s i the damper-actuatingbar,"a-ndlafpin 17 fittejd' a transversely through the lever atthe base of ofthe dQg illd' nse etch" f-T mati ee? s the upper "end ther'edf while thesnetch 19". in

" th'e'dog I4; is located near the letter end-there-f of. Th op sh dero ip f 'e s e' ne' a of each notch' 'is disposediobliquely with re;

spect toithe edgeofthe'dogbut the shoulder is at'the upper end'oftlie'notch"l9r an'daat the, V f 1 lower end of the notcli18. Attached to the" respective dogs are retraotile' springs 2Q, 21 which extend across the casing and havetheir; Fig. 3 isa detail elevation, viewingthe side QPPQSYP e-n s t a heg t0 I h Q l g SCZTQWS' V 22 whlchare'mountedan lugs 23'on thecasing j-e latch is indicated at '24 whioli m 105;- caused to 'bear'against the sideof the casing tive. r

justablie thereintoregulate tlieten-i 5}; 'rsio'n Ofthespri gsk I LIT and thereby'hol d' the dog' ,lzga gi o mi I post '5 and yokeifi upward fjand: the vfree end sponding movement being impartedto the dog 15 to effect engagement between the pin and tlienotchand tlie'movement-is so timed. 7' c p 7 that the dampersfwill be closed when the pin been adjusted to degree of vacuum desired in the heating system, the parts will beheld in the positioninwhich they are now set until V the reduction of pressure in the system pro-3 A duces the-predetermined 'degree of vacuumg ,7 whereuponthe;resulting'suctionwill tend to 1 1 draw the lever 7-downward, releasingthe pin I of the-lever? isf swingin'g upward; ia :co'rre+ 17 p from the notch '18. 'The' downward rocking ,s V

of the lever {Z will eif ectopeningofthe damp.

25 I the, tension of the springs being resgf ers and will continue until the pin 17 engages v the notch 19 which will hold the parts until i Y the pressure of the steam overcomes the tension of the s ring 20 whereupon the cycle of t t operation wi '1 be repeated. The device is exceedingl simple and compact and may be easilyapp ied to any furnace at a slight cost. After being installedit needs a no attention and operates automatically and due to reduction of the pressure reaches a pre-,;

eificiently to cu .o fir h af n he g n-;, :l, a erate'd steam attainsya predetermined pres 1 sure and to open the draft when the vacuum determined degree.

' Having thus described my invention, what i Patent oftheUnited States, is

1. In a draft-regulator, a pressure-res on- I claim as new and desire to secure by Letters sive da-mper-actuatinglever, apair of ogs H setto hold the lever raisedagainst t ence'of a pre-determined degree of vacuum and lowered against the influence of a predef arranged adjacent the free'end of the lever and adapted one'to engage thelever at the uperjlimit of'its movement and one to engage.

it, at the lower limit of its movement, and

springs attached to the'respective dogs to effect engagement of the same with the lever,

terminedpressure. i

2. Ina draft-regulator, a damper-actuating lever fulcrumed at one end and having a fork at its free end, a pressure-responsive post bearing against the under side of the lever between the ends thereof, a pair of dogs passing through the fork of thelever and fuledge near its upper end and the other dog I crumed at their lower ends below the lever,

one of said dogs having a notch inits inner having a notch in its inner edge near its lower end, a pin in the lever at the base of the fork, and means for rocking theres ective levers to effect engagement between t 'e pin and the notch presented thereto.

Signed ofMarch, 1928.

CLARE HUTCHISON. Administratrix 'of Maurice Frank Hutchiso n, deceased.

ctively I at Herndon, Virginia, this 6th day" 

